Actually, it's very simple. Checkout (helix):
http://www.realnetworks.com/industries/mob...ucer/index.html and snapstream (Beyond TV):
http://www.snapstream.com/Products/Products_PVS3.aspSnapstream is veeeery user friendly, but windows only as far as I know, but only on the Server-end:
The server end (with the TV card) has to run Windows OS, and the client end (PCs, Laptop, Zaurus, WinCE or other mobile devices just need to be able to receive "windows media format" or MPEG-2, which the Zaurus is capable I believe.
Helix (from RealMedia) runs on Linux or Windows and streams to Real Media, although I think mpeg-2 is also supported. This is important, because the Zaurus can't play realmedia yet (they are working on it!!!). Also Helix is a LOT more complex. ("Beyond TV" is very easy to set up!!!).
Helix is a very high end professional solution (=pricy!) whereas "Beyond TV (formely known as "Personal Video Station") costs less than a 100 bucks!!!!
NB: this is also ideal to share your TV card over the network (even if you don't have a PDA), wether this is in a company or at home for the wife and kids
Good luck